package com.lagou.client;


import com.lagou.handler.UserClientHandler;
import com.lagou.vo.JSONSerializer;
import com.lagou.vo.rpc.RpcEncoder;
import com.lagou.vo.rpc.RpcRequest;
import io.netty.bootstrap.Bootstrap;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.string.StringDecoder;
import org.springframework.stereotype.Service;

import java.lang.reflect.Proxy;
import java.util.UUID;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

/**
 * 消费者
 */
@Service
public class RPCConsumer {

    //1.创建一个线程池对象  -- 它要处理我们自定义事件
    private static ExecutorService executorService =
            Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors());

    //2.声明一个自定义事件处理器  UserClientHandler
    private UserClientHandler userClientHandler;


    //3.编写方法,初始化客户端  ( 创建连接池  bootStrap  设置bootstrap  连接服务器)
    public void initClient() throws InterruptedException {
        //1) 初始化UserClientHandler
        this.userClientHandler  = new UserClientHandler();
        //2)创建连接池对象
        EventLoopGroup group = new NioEventLoopGroup();
        //3)创建客户端的引导对象
        Bootstrap bootstrap =  new Bootstrap();
        //4)配置启动引导对象
        bootstrap.group(group)
                //设置通道为NIO
                .channel(NioSocketChannel.class)
                //设置请求协议为TCP
                .option(ChannelOption.TCP_NODELAY,true)
                //监听channel 并初始化
                .handler(new ChannelInitializer<SocketChannel>() {
                    protected void initChannel(SocketChannel socketChannel) throws Exception {
                        //获取ChannelPipeline
                        ChannelPipeline pipeline = socketChannel.pipeline();
                        //设置编码
//                        pipeline.addLast(new StringEncoder());
//                        pipeline.addLast(new StringDecoder());


                        pipeline.addLast(new RpcEncoder(RpcRequest.class, new JSONSerializer()));
                        pipeline.addLast(new StringDecoder());
//                        pipeline.addLast(new RpcDecoder(RpcRequest.class,new JSONSerializer()));
//                        pipeline.addLast(new RpcEncoder(RpcResponse.class,new JSONSerializer()));
                        //添加自定义事件处理器
                        pipeline.addLast(userClientHandler);
                    }
                });

        //5)连接服务端
        bootstrap.connect("127.0.0.1",8999).sync();
    }

    //4.编写一个方法,使用JDK的动态代理创建对象
    // serviceClass 接口类型,根据哪个接口生成子类代理对象;   providerParam :  "UserService#sayHello#"

    public Object createProxy(Class<?> serviceClass) {
        Object proxyInstance = Proxy.newProxyInstance(Thread.currentThread().getContextClassLoader(), new Class[]{serviceClass}, (proxy, method, args) -> {

            //2初始化客户端
            if (this.userClientHandler == null) {
                initClient();
            }

            RpcRequest request = new RpcRequest();
            request.setRequestId(UUID.randomUUID().toString());
            request.setClassName(method.getDeclaringClass().getName());
            request.setMethodName(method.getName());
            request.setParameterTypes(method.getParameterTypes());
            request.setParameters(args);


            //3设置参数
            userClientHandler.setParam(request);

            //请求服务端
            return executorService.submit(userClientHandler).get();
        });

        return proxyInstance;
    }
//    public Object createProxy(Class<?> serviceClass){
//        return Proxy.newProxyInstance(Thread.currentThread().getContextClassLoader(), new Class[]{serviceClass}, (proxy, method, args) -> {
//
//            //2初始化客户端
//            if (this.userClientHandler == null) {
//                initClient();
//            }
//
//            RpcRequest request = new RpcRequest();
//            request.setRequestId(UUID.randomUUID().toString());
//            request.setClassName(method.getDeclaringClass().getName());
//            request.setMethodName(method.getName());
//            request.setParameterTypes(method.getParameterTypes());
//            request.setParameters(args);
//
//
//            //3设置参数
//            this.userClientHandler.setParam(request);
//
//            //请求服务端
//            return executorService.submit(this.userClientHandler).get();
//        });
//
//        return proxyInstance;
//    }
//    {
//        return Proxy.newProxyInstance(Thread.currentThread().getContextClassLoader(),
//                new Class[]{serviceClass}, new InvocationHandler() {
//                    public Object invoke(Object o, Method method, Object[] objects) throws Throwable {
//                        //1)初始化客户端cliet
//                        if(userClientHandler == null){
//                            initClient();
//                        }
//                        RpcRequest request = new RpcRequest();
//                        request.setRequestId(UUID.randomUUID().toString());
//                        request.setClassName(method.getDeclaringClass().getName());
//                        request.setMethodName(method.getName());
//                        request.setParameterTypes(method.getParameterTypes());
//                        request.setParameters(objects);
//
//                        //2)给UserClientHandler 设置param参数
////                        userClientHandler.setParam(providerParam+objects[0]);
//                        userClientHandler.setParam(request);
//
//                        //3).使用线程池,开启一个线程处理处理call() 写操作,并返回结果
//                        Object result = executorService.submit(userClientHandler).get();
//
//                        //4)return 结果
//                        return result;
//                    }
//                });
//    }

}
